Thirty years ago today, the space shuttle Challenger blasted off at 11:38 a.m. ET. Then, 73 seconds after liftoff, a fireball engulfed the shuttle.
As a horrified America watched on live television, the orbiter broke apart, dooming its crew of seven, including high school teacher Christa McAuliffe, who was supposed to become the first civilian in space.
The accident, which was eventually blamed on failed rocket O-rings as well as pressure within NASA to keep launches on schedule, forced a reassessment of the shuttle program and the dangers inherent in human spaceflight.
NASA's has a Day of Remembrance that honors the Challenger victims as well as the lost crews of the Columbia, Apollo 1 and other astronauts killed in the line of duty.
Here are some Space Shuttle Facts from NASA - click HERE.
What do you remember about that day?
Where were you when you heard the news?
How were you affected?
Send us a note about your experience.